<template>
    <div :class="className" :style="{height:height,width:width}"/>
</template>

<script>
  import echarts from 'echarts'

  require('echarts/theme/macarons') // echarts theme
  import { debounce } from '@/utils'
  import { getChartData } from '@/api/visits'

  export default {
    props: {
      className: {
        type: String,
        default: 'chart'
      },
      width: {
        type: String,
        default: '100%'
      },
      height: {
        type: String,
        default: '350px'
      },
      autoResize: {
        type: Boolean,
        default: true
      }
    },
    data() {
      return {
        chart: null,
        sidebarElm: null,
        chartData: {
          visitsData: [],
          ipData: []
        },
        weekDays: [],
        dates: []
      }
    },
    mounted() {
      getChartData().then(res => {
        this.chartData.visitsData = res.visitsData
        this.chartData.ipData = res.ipData
        this.weekDays = res.weekDays
        this.dates = res.dates
        this.initChart()
      })
      if (this.autoResize) {
        this.__resizeHandler = debounce(() => {
          if (this.chart) {
            this.chart.resize()
          }
        }, 100)
        window.addEventListener('resize', this.__resizeHandler)
      }

      // 监听侧边栏的变化
      this.sidebarElm = document.getElementsByClassName('sidebar-container')[0]
      this.sidebarElm && this.sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler)
    },
    beforeDestroy() {
      if (!this.chart) {
        return
      }
      if (this.autoResize) {
        window.removeEventListener('resize', this.__resizeHandler)
      }

      this.sidebarElm && this.sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler)

      this.chart.dispose()
      this.chart = null
    },
    methods: {
      sidebarResizeHandler(e) {
        if (e.propertyName === 'width') {
          this.__resizeHandler()
        }
      },
      setOptions({ visitsData, ipData } = {}) {
        this.chart.setOption({
          xAxis: {
            data: this.dates,
            boundaryGap: false,
            axisTick: {
              show: false
            }
          },
          grid: {
            left: 10,
            right: 10,
            bottom: 60,
            top: 30,
            containLabel: true
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross'
            },
            padding: [5, 10]
          },
          yAxis: {
            axisTick: {
              show: false
            }
          },
          legend: {
            data: ['访问量', '访问IP']
          },
          dataZoom: [{
            type: 'slider',
            show: true, //flase直接隐藏图形
            xAxisIndex: [0],
            left: '3%', //滚动条靠左侧的百分比
            bottom: 20,
            start: 0,// 滚动条的起始位置
            end: 100 //滚动条的截止位置（按比例分割你的柱状图x轴长度）
          }],
          series: [{
            name: '访问量',
            itemStyle: {
              normal: {
                color: '#FF005A',
                lineStyle: {
                  color: '#FF005A',
                  width: 2
                },
                label: {
                  show: true
                }
              }
            },
            smooth: true,
            type: 'line',
            data: visitsData,
            animationDuration: 2800,
            animationEasing: 'cubicInOut'
          },
            {
              name: '访问IP',
              smooth: true,
              type: 'line',
              itemStyle: {
                normal: {
                  color: '#3888fa',
                  lineStyle: {
                    color: '#3888fa',
                    width: 2
                  },
                  areaStyle: {
                    color: '#f3f8ff'
                  },
                  label: {
                    show: true
                  }
                }
              },
              data: ipData,
              animationDuration: 2800,
              animationEasing: 'quadraticOut'
            }]
        })
      },
      initChart() {
        this.chart = echarts.init(this.$el, 'macarons')
        this.setOptions(this.chartData)
      }
    }
  }
</script>
